Theoretical study of CP-VC: A simple, robust and accurate MAS NMR method for analysis of dipolar C-H interactions under rotation speeds faster than ca. 60Â kHz

Dipolar slices at δ13C = 50 ppm in CP-VC spectra of l-alanine, recorded versus resonance irradiation on 13C channel done at: 0 (a), 50 (b), 100 (c), and 150 (d) ppm.83